diff --git a/DAS/simulator.py b/DAS/simulator.py
index d2c95f9..5181cca 100644
--- a/DAS/simulator.py
+++ b/DAS/simulator.py
@@ -170,6 +170,8 @@ class Simulator:
                 val1.rowNeighbors[id].update({val2.ID : Neighbor(val2, 0, self.shape.blockSizeR)})
                 val2.rowNeighbors[id].update({val1.ID : Neighbor(val1, 0, self.shape.blockSizeR)})
 
+        for id in range(self.shape.blockSizeR):
+            
             if not columnChannels[id]:
                 self.logger.error("No nodes for column %d !" % id, extra=self.format)
                 continue